The vapour pressure of a solvent at `25^@C` is 270 mm Hg. Calcualte the number of moles of a non-volatile solute per mole of solvent needed to get a solution with vapour pressure 170 mm Hg at `25^@C`.

The vapour pressure of a solvent is found to be 400 mm Hg at 300 K. When a certain amount of a nonvolatile solute is added to 50 mol of the solvent its vapour pressure decreases to 360 mm Hg. The amount of solute added is

The vapour pressure of a dilute aqueous of glucose is 750 mm of mercury at 373 K. The mole fraction of solute is

The vapour pressure of acetone at 20^@C is 185 torr. When 1.2 g of a non-volatile solute was dissolved in 100 g of acetone at 20^@C its vapour pressure was 183 torr. The mass (g mol^(-1)) of the substance is.

Two liquids A and B form an ideal solution. At 300 k, the vapour pressure of a solution containing 1 mole of A and 3 moles of B is 550 mm of Hg. At the same temperature, if one mole of B is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. Determine the vapour pressure of A and B in their pure states.

The vapour pressure of water is 17.5 torr at 20^@C . When the relative humidity is 45%, the number of moles, of water present at 20^@C in 1 L of air is

The vapour pressure of a solvent decreases by 10 mm of Hg when a non-volatile solute is added to it. The mole fraction of the solute in solution is equal to 0.2. What should be the mole fraction of solvent if the decrease in vapour pressure is to be 20 mm Hg?

Calculate the vapour pressure of the solution. The molefraction of the solute is 0.25. The vapour pressure of the pure solvent is 0.8atm.

Show graphically how the vapour pressures of a solvent and a solution of a non-volatile solute in it change with temperature. Show on the graph boiling point of the solvent and the solution. Which is higher and why?

The vapour pressure of C Cl_(4)" at "30^(@)C is 143 mm of Hg.0.5 gm of a nonvolatile non electrolyte substance with molar mass 65 is dissolved in 100 ml of C Cl_(4) . What will be the vapour pressure of the solution. Density of C Cl_(4)" at "30^(@)C = "1.58 gm per cc."